Grade 12th pass10 grade maths
Please solve this and give full explanation and how we put in this cos please tell me
Please solve this and give full explanation and how we put in this cos please tell me
1 Answer
Aastha Singh
Dear student,
from formula:
sin2A = 2 sinA cosA ->equation 1
from question:
2 sinA cosA= sinA
2cosA =sinA/sinA
cos A = ½ ->eqn 2
since,
cos 60 =1/2 ->from theory
cos A = ½ →from eqn 2
A = 60 deg
hope this helps :)
from formula:
sin2A = 2 sinA cosA ->equation 1
from question:
2 sinA cosA= sinA
2cosA =sinA/sinA
cos A = ½ ->eqn 2
since,
cos 60 =1/2 ->from theory
cos A = ½ →from eqn 2
A = 60 deg
hope this helps :)
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